In　low-speed　network,　it　is　usually　adequate　to　wait　for　congestion　to　occur　and　then　react　to　it　by　telling　the　source　of　packe

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问题 In　low-speed　network,　it　is　usually　adequate　to　wait　for　congestion　to　occur　and　then　react　to　it　by　telling　the　source　of　packets　to　slow　down.　In　high-speed　networks,　this　approach　often　works　poorly,　because　in　the(61)between　sending　the　notification　and　notification　arriving　at　the　source,　thousands　of　additional(62)may　arrive.　In　ATM　network,　a　major　tool　for　preventing(63)is(64)control.　When　a　host　wants　a　new　virtual(65),　it　must　describe　the　traffic　to　be　offered　and　the　service　expected.

选项 A、path
B、rout
C、circuit
D、way

答案C

解析在低速网络中，网络拥塞经常发生，通过通知包的发送者放慢速度来对此做出反应。在高树甲络中，这种方法通常是不起作用的，因为在发送通知与同志到达这段(61)内，成千上万的额外的(62)可能会来到。在ATM网络中，改善(63)的主要方法是(64)控制。当一个主机想要一个新的虚拟(65)时，它必须描述线路情况和服务的需要。

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